HttpContext.Current.Request.UserHostAddress is null

Question

In my Dev Machine HttpContext.Current.Request.UserHostAddress is null. Why? how can I turn it on?
How can I get list of Ips in case of a proxy client?

WCF Service with ASP.net 4 window7.

Thanks

I never get an empty/null, but Cassini returns a "::1" now for whatever reason. — Doozer Blake, Oct 06 '11 at 15:18
@DoozerBlake the ::1 is IPv6's version of 127.0.0.1. Source: http://stackoverflow.com/a/4611421/84395 — Andy T, Jul 22 '13 at 18:19

score 8 · Accepted Answer · edited Sep 14 '12 at 19:45

8

to avoid this problem you can parse the HTTP_X_FORWARDED_FOR for the last entery IP.

ip=Request.ServerVariables["HTTP_X_FORWARDED_FOR"] ;
if (!string.IsNullOrEmpty(ip))
{
   string[] ipRange = ip.Split(',');
   int le = ipRange.Length - 1;
   string trueIP = ipRange[le];
}
else
{
   ip=Request.ServerVariables["REMOTE_ADDR"];
}

Hope this will helps you

edited Sep 14 '12 at 19:45

Oppa Gingham Style

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answered Oct 06 '11 at 13:22

Viral Sarvaiya

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4

Just a note about `Viral Sarvaiya`'s answer. According to [Wikipedia](http://en.wikipedia.org/wiki/X-Forwarded-For) and [Amazon](http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/TerminologyandKeyConcepts.html) the X-Forwarded-For header has the following format: > X-Forwarded-For: client, proxy1, proxy2 This means you should be using the first string in `ipRange`, not the last. – dubrowgn Mar 23 '15 at 17:23

HttpContext.Current.Request.UserHostAddress is null

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